US429580A

US429580A - Let-off mechanism foe looms

Info

Publication number: US429580A
Authority: US
Publication date: 1890-06-03
Anticipated expiration: 1907-06-03

Description

2 Sheets--Sheet 1.

Patented June 3 G. PARK.

(No Model.)

LET-OPPMEGHANISM FOR LOOMS. No. 429,580.

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(No Model.)

G. PARK. LET-OFF MEGHANISM IFORLOOMS.

.No. 429,580, Patented June 3,1890

I w i/tmpooeo/ UNITED STATES PATENT Futon.

GILBERT PARK, OF SPENCER, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO 'JOHN G. AVERY, OF SAME PLACE.

LET-OFF MECHANISM FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 429,580, dated'June 3, 1890.

Application filed July 23, 1889. Serial No. 318,373. (No model.) I

. To all whom it may concern.-

Be it known that I, GILBERT PARK, a citizen of the United States, and a resident of Spencer, in the State of Massachusetts, have invented a new and useful Improvement in Let-Off Mechanism for Looms, of which the following is a specification.

This invention consists in a graduator of novel construction and in certain novel combinations of parts, as hereinafter set forth and claimed, the whole being embodied in a simple let-off for power-looms. Its primary object is to render the graduator absolutely positive in its action, and thus to insure uniform delivery of the warp and the exact number of picks to the inch which the let-off is set for.

Other objects of the invention are to facilitate adapting the regulator to difierent styles of looms, to facilitate adjusting the let-off for cloth of more or less picks to the inch, and to provide for lifting the dogs of the ratchet mechanism for pick-outs without going be hind the loom.

Two sheets of drawings accompany this specification as part thereof.

Figure 1 of the drawings represents a verti-' cal section through a loom provided with a let-off constructed according to this invention, other parts which do not directly coact with the let-off being omitted. Fig. 2 represents a fragmentary plan view of the parts substantially at and below the section-line 2 2, Fig. 1. Fig. 3 represents a back view of the upper part of the let-off mechanism. Fig. 4 represents a plan view of the parts at and immediately belowthe line 4 4, Fig. 3. Fig. 5 represents a fragmentary elevation drawn across from Fig. 8. Fig. 6 represents a front elevation of a graduator detached. Fig. 7 represents a fragmentary sectional elevation cor-, responding with Fig. 1 as to plane and illustrating a horizontal arrangement of the improved let-off; and Fig. 8 represents a fragmentary elevation of parts at and behind the line 8 8, Fig.7.

Like letters of reference indicate corresponding parts in the several figures.

In carrying this invention into effect Iprovide the lower or main shaft A of a patternloom or other power-loom near one of its end frames B with a let-off cam O, which is preferably double and of the simple elliptical shape represented in Fig. 1 or 7. The cam O engages with a lever D, which works on a pivot E, supported by said end frame B, and is connected by a link F with an oscillating dog-holder G, whose dogs H mesh with a ratchet-wheel I, fast on the ratchet-shaft 'J, which also carries the customary endless screw or worm K, in mesh, when in operation, with a worm-wheel L, fast on the shaft of the warp-beam M.

To graduate the successive let-off movements according to the diameter of the warp on the warp-beam M, a short rock-shaft Nis mounted below the latterand parallel therewith in suitable bearings O 0 which may be attached to any convenient part of the loomframe, as the bar P, Figs. 1 and 2, or to the floor. This rock-shaft and its bearings, together with a fan Q and an arm R, Figs. 1, 2, and 6, car-. ried by the rock-shaft, and the appurtenances of these parts, constitute my graduator. The fanQ comprises a hub a, Fig. 6, which is made fast on the rock-shaft N by a set-screw,

for example, so that the fan may be adjusted longitudinally and angularly on the rockshaft to suit the warp-beam of the loom. An extensible shank b, Fig. 6, adapts the graduator to different distances between the bearings O O and those of the warp-beam. The shankb is rendered extensible, for example, by forming the same of overlapping parts, one of which is longitudinally slotted, as shown at 11 Fig. 6, while the otheris provided with screw-tapped holes for the reception of screws 12 by which the parts are united. A concave follower 0, attached to the upper end of said shank b by a pivot parallel with the. rock-shaft N, adapts the fan to accommodate itself to the dwindling warp on the beam and to bear uniformly against the same. Alight torsion-spring S surrounds the rock-shaft between its bearings O O and abuts and reacts against said bearing 0 and against a short arm T at its respective ends, the latter being fastened on the rock-shaft by a set-screw, so as to be angularly adjustable independently of the fan Q and of the arm R, which, as shown,

is also angularly adjustable on the rock-shaft in like'manner. The arm R is made in two parts. The main part, which is attached to the rock-shaft, projects rearwardly therefrom,

and is provided with a longitudinal series of holes (1, and a bolt e, which occupies one or another of these holes, attaches a laterallyproj eetin g part which carries a fingerf. This 5 finger engages with a back-stop projection g on the lever D, and by limiting its return movements determines the effective movements imparted by the cam O therethrough and through the link F, dog-carrier Gr, dogs IO H, ratchet-wheel I, shaft J, worm K, and gear L to the warp-beam. The position of the end of the finger fis determined in an obvious manner by that of the fan Q, as illustrated by full and dotted lines in Fig. 1, and the position of the fan is determined directly by the diameter of the warp on the warp beain M, the follower c of the fan being held against the outer layer of the warp by the spring S. By the several adjustments provided for in the graduator, as above described, one and the same make thereof is adapted to be applied to different makes of loom, which is a great convenience in attaching the same to looms now in use.

The cam C is preferably set on the shaftA so that it lets off when the lay is going back. Thus when the laystrikes the cloth the warp is held taut and the filling goes in better.

The main portion of the lever Dand the 0 ratchet-shaft J may, as regards the main fun 0- tions of my let-off, be either vertical, as repre sentedin Figs. 1 to 5, inclusive, or horizontal, as represented in Figs. 7 and 8, as may best suit any particular style of loom. The let-off 3 5 mechanism represented by said Figs. 1 to 5, inclusive, embodies the remaining features of my present invention, and will 110w be more particularly described. The lever D, in this vertical arrangement, is composed of several parts united by screws d and (Z passing through longitudinal slots (1 and (2*,

as shown in Figs. 1 and 2, so as to provide for varying the distance between its contact-piece h, or the cam C, which engages therewith, and the pivot E, which is conveniently fixed. The contact-piece 72. and back-stop surface g both form part, preferably, of a horizontal extension of the lever 1') at its lower extremity, and the slot (Z provides for bodily raising or lowering said horizontal extension of the lever, and thus adjusting the contact-piece vertically, while the slot (Z and the screws (1, which pass therethrough into a rebent portion of the contact-piece 72 serve as means 5 5 for adjusting the latter horizontally with reference to the cam. A series of preliminary adjustments to determine the number of picks at a given starting-point begin with the vertical adjustment provided for by said slot (Z Finer adjustments, to determine the number of picks with the utmost nicety, are provided for at the top of the let-off mechanism, as best seen in Figs. 3, 4, and 5. To complete the preliminary adjustments, the lever-arm i of the dog-carrier G is screw-threaded and provided with a pair of nuts j, between which the link F works with more or less leverage,

according to the adjustment of the nuts. hen the preliminary adjustments below and at this point have been completed, a given vertical position of the pivot 7r at the front end of the link F means a definite number of picks to the inch. To provide for readily setting the let-oif for a diiferent rate of pick, the upper end of the lever D has a 1011- gitudinal slot- Zto coact with the bolt-and-nut shank of said pivot 7.x, and is furnished on its outer side with a scale m, Fig. 5, by reference to which said pivot may be set at once at the proper point for given work. The ratchet-wheel I is also vertically adjustable on the shaft J, being made fast thereon at the proper height by a set-screw n. The dogholder Gr rests upon the hub of the ratchetwheel and moves vertically therewith. It may be held down by a movable collar U above it, fastened on the shaft J by a setscrew 02 The preliminary adjustments above described need only be disturbed when a variation of the number of picks is desired greater than that provided for by said slotZ and scale on, say a variation of from forty to sixty picks per inch. By said preliminary adjustments such wide variations are provided for, and the employment of a longer slot and scale and a correspondingly long lever and ratchet-shaft is obviated.

The dogs II are preferably four in number, and each of the last three is an eighth of an inch shorter than the preceding dog, so that one will always bite one of the crown-teeth of the ratchet-wheel. The number of dogs may be increased for finer work, and the variation in their length thus reduced to one-sixteenth of an inch. The dogs are held down to their work by springs o.

For lifting the dogs II to free the ratchetwheel I and shaft J when a fresh warp-beam is being attached or in case of pick-outs, I provide a lifter V in the form of a slotted disk with a radial arm over each dog. It is held down upon the dog-carrier G, and its independent motion is limited by screws 1), Fig. 4, passing through its slots. The dogs have inclined rear ends to coact with the said radial arms of the dog-lifter, and by turning the latter independently of the dog-carrier the dogs are simultaneously lifted clear of the ratchetteeth, as shown in dotted lines in Figs. 8 and i.

For turning the dog-lifter from the front of the loom in case of pick-outs, a hand-rod WV is coupled to an upturned arm g on the dog lifter, and its free end is supported, when it is not in use, by a hook r, Fig. 1, which may be attached to or formed on any fixed part within the arch B of the loom.

For turning the ratchet-shaftJ when a fresh warp-beam is being attached, the customary hand-wheel X is fastened 011 the shaft at its upper end. For turning the same from in front of the loom in case of pick-outs, the shaft is provided with a fast bevel gear- IIO wheel Y, which is conveniently formed on the under side of said hand-Wheel X, and the same is meshed by a bevel-pinion Y Fig. 1,

- carried by the rear end of a horizontal shaft Z, the front end of which is provided with a hand-wheel X The'shaft Z turns freely in bearings s .9, formed on a frame-piece B which is conveniently attached to the arch B, and may serve also to support the said hook r, as shown.

when the loom is at work, the shaft Z turns with the shaft J and the hand-rod \V reciprocates with the oscillating dog-carrier In the horizontal arrangement represented by Figs. 7 and 8 the finger f of the graduator is turned up, the back-stop projection g moving vertically. Otherwise the graduator may be constructed as for the other arrangement. The pivot E is adjustable within coincident horizontal slits t, Fig. 7, in the lever D and the adjoining end frame to regulate the letoff as to rate of pick. The dog-carrier and ratchet-wheel may be of any approved make suited to the horizontal ratchet-shaft.

In both arrangements gravity may suffice to effect the return movements of the levers D, links F, and dog-carriers G, or the customary spiral springs may be employed for this purpose. The several parts will be made of suitable metals and of appropriate shapes and proportions with proper mechanical details. In'makin g let-offs for new looms many of the adjustments represented in the drawings may be omitted, and other like modifications will suggest themselves to machinists.

Details which have not been specified may be of any approved description.

Having thus described the said let-ofis, I claim as my invention and desire to patent under this specification- 1. In combination with the warp-beam and with a let-off cam, its shaft, and mechanism which transmits motion from said cam to said warp-beam, including a moving part, as a lever, provided with a back-stop surface, a positive-motion graduator comprising a rock-shaft parallel with the axis of the warp-beam, a fan which coacts with the periphery of the warp-beam and which is adjustable angularly upon said rock-shaft, and an arm carrying a fingerwhich coacts with said back-stop surface and connected with said fan by said rock shaft, substantially as hereinbefore specified.

2. In combination with the warp-beam and with a let-0E cam, its shaft, and mechanism which transmits motion from said cam to said warp-beam, including a moving part, as a lever, provided with a backstop surface, a

.graduator comprising a rock-shaft parallel with the axis of the warp-beam, a fan adjustable angularly upon said rock-shaft and having at its upper end a concave follower, with a pivot parallel to said axis which coacts with the periphery of the Warp-beam, and an arm carrying a finger which coacts with said backstop surface and moves with said fan, substantially as hereinbefore specified.

Incombination with the warp-beam and with a let-off cam, its shaft, and mechanism which transmits motion from said cam to said warp-beam, including a moving part, as a lever, provided with a back 7 stop surface, a graduator comprising a rock-shaft parallel with the axis of the warp-beam, a fan which coacts with the periphery of the warp-beam, an arm carrying a finger which coacts with said back-stop surface and moves with said fan, a torsional spring surrounding said rockshaft, and a fixed part and an angularly-adj ustable arm, against which the respective ends of the spring abut and react, substantially as hereinbefore specified.

4:. In combination-with the warp-beam and with a let-off cam, its shaft, and mechanism which transmits motion from said cam to said warp-beam, including a moving part, as a lever, provided with a back-stop surface, a graduator comprising a rock-shaft parallel with the axis of the warp-beam, a fan which coacts with the periphery of the warp-beam and is adjustable angularly and longitudinally upon the rock-shaft, and an arm carrying a finger which coacts with said back-stop surface and moves with said fan, substantially as hereinbefore specified.

5. In combination with the warp-beam and with a let-off cam, its shaft, and mechanism which transmits motion from said cam to said warp-beam,including a moving part, as a lever, provided with a back-stop surface, a graduator comprising a rock-shaft parallel with the axis of the warp-beam,a fan having a concave follower which coacts with the periphery of the warp-beam, and an extensible shank, and an arm carrying a finger which coacts with said back-stop surface and moves with said fan, substantially as hereinbefore specified.

6. In combination with the warp-beam and with a let-off cam, its shaft, and mechanism which transmits motion from said cam to said warp-beam, including a vertical lever and a fixed pivot therefor, the lever having a horizontal extension at its lower end terminating in a contact-piece and provided with a back stop surface, a graduator comprising a rock shaft parallel with the axis of the warp-beam, a fan which coacts with the periphery of the warp-beam, and an arm carrying 'a finger which coacts with said back-stop surface and moves with said fan, said arm being composed of two parts and means for adjusting one upon the other, substantially as hereinbefore specified.

'7. The combination, with the'let-oif cam and its shaft, of a vertical lever and a fixed pivot therefor, the lever having a contactpiece and means for adjusting the same, a connecting-link coupled to the upper end of said lever, and an oscillating dog-carrier havin a lever-arm provided with nuts, between which said link is coupled thereto, substantially as hcreinbefore specified.

8. The combination, with a let-oil cam and its shaft, of a vertical shaft and a vertical 1ever, the latter provided at its upper end with a longitudinal slot, a linlcpivot vertically adjustable within said slot, a ratchet-wheel and an oscillating dog-carrier, both of which are vertically adjustable upon said shaft, and a link connecting said pivot and dog-carrier, substantially as hereinbefore specified.

9. The combination, with a let-off cam and its shaft, of a vertical ratchet-shaft and avertical lever, the latter having at its lower end a contact-piece and means for adjusting the same, and provided at its upper end with a longitudinal slot and a graduated pick-scale parallel with said slot, a link-pivot vertically adjustable within said slot, a ratchet-wheel and an oscillating (log-carrier, both of which are vertically adjustable upon said shaft, and a link connecting said pivot and dog-carrier, substantially as hereinbefore specified.

10. The combination, in a let-off for looms, of a vertical shaft, acrown ratchet-wheel fastened thereon, a superposed dog-carrier with its dogs, which oscillates upon said shaft, and a dog lifter in the form of a superposed disk, having radial arms which engage with and lift the dogs when the disk is independently turned, substantially as hereinbefore specified.

11. The combination, in a let-off for looms, of a vertical shaft, a crown ratchet-wheel fastened thereon, a superposed dog-carrier with its dogs, which oscillates upon said shaft, a dog-lifter in the form of a superposed disk, having radial arms which engage with and lift the dogs when the disk is independently turned, and a hand-rod extending back from the arch of the loom and coupled to said disk, substantially as hcreinbefore specified.

GILBERT PARK.

\Vitnesses:

CHESTER T. LINLEY, Joan E. GODDARD.